PSN-L Email List Message

Subject: Re: More productive exchange of ideas with graphics?
From: "Geoff" gmvoeth@...........
Date: Fri, 9 Nov 2007 09:38:56 -0700

You can imagine the wave as a straight line
approaching and according to the times received
at different stations know direction by the
displacement in time between two stations
using only first time of arrival.
With two stations you get two possibilities
with direction and distance but more than likely
only one direction will be the Common EQ area.

As long as no human is playing
games with your station you
should be able to have faith
in your results.

----- Original Message ----- 
From: "Keith Payea" 
Sent: Friday, November 09, 2007 9:26 AM
Subject: RE: More productive exchange of ideas with graphics?

> All:
> One person's problem is another's data.  Instead of trying to constrain the
> movement to one direction, try to figure out a way to measure the
> displacement direction as well as amplitude.  Then one could detect
> earthquakes from any direction and know something about the direction the
> waves were travelling.
> Just throwing another log on this bonfire, I'm afraid...
>    Keith
>  _____  
> From: psn-l-request@.............. [mailto:psn-l-request@............... On
> Behalf Of Jerry Payton
> Sent: Friday, November 09, 2007 7:46 AM
> To: psn-l@..............
> Subject: Re: More productive exchange of ideas with graphics?
> John,
> I agree that visualization is VERY difficult sometimes, but I hesitate
> creating a separate blog since it might water down the discussions here.
> People might move to the blogs instead of here and some might be left out of
> the comments.
> I am doing a "desktop experiment" right now with this and it would best be
> show rather than described.  I am suspending a ball point pen, as discussed.
> On the other end of the pen is a ring magnet which is suspended about 1/2"
> above the edge of a spool of bulk wire, which is connected directly
> connected to my electronics.
> Thus far, it detects my walking up to the desk and other movements.  I am
> allowing some time to see if an EQ event happens (I hope).  Of course, it is
> not damped and movement could be in any direction.  I haven't crossed that
> bridge yet.
> Jerry
> ----- Original Message ----- 
> From: John Lahr   
> To: psn-l@.............. 
> Sent: Friday, November 09, 2007 9:26 AM
> Subject: More productive exchange of ideas with graphics?
> The discussion of various hinges and seismometer designs is very 
> interesting, but in many cases I find it difficult to visualize the 
> exact setup that is being described.  A photograph or a sketch would 
> be very helpful.
> One way to do this is to start a blog.  It's easy to do 
> at:  I started a blog, just to see how it 
> worked, and it only took a few minutes to add an entry.  My "trial" 
> entry shows the AS-1 sensor:
> I'm sure there are other posting options as well.
> Cheers,
> John
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